Lodash _.assignIn() Method

Lodash _.assignIn() method is like the _.assign() method except that it iterates over its own and inherited source properties. Subsequent source objects overwrite property assignments of previous sources. This method mutates the object.

Syntax:

_.assignIn( dest_object, [src_obj]);

Parameters:

• dest_object: This is the destination object.
• src_obj: These are the source objects.

Return Value:

This method returns an object.

Example 1: In this example, we are getting an object which has all of it’s previous inherited object properties because of the lodash _assignIn() method.

Javascript

// Defining Lodash variable
const _ = require('lodash');

function Gfg1() {
    this.a = 1;
}

function Gfg2() {
    this.c = 3;
}

Gfg1.prototype.b = 10;
Gfg2.prototype.d = 40;

console.log(_.assignIn({ a: 4 },
    new Gfg1, new Gfg2));

Output:

{ a: 1, b: 10, c: 3, d: 40 }

Example 2: In this example, we are getting an object which has all of it’s previous inherited object properties because of the lodash _assignIn() method.

Javascript

// Defining Lodash variable
const _ = require('lodash');

function Gfg1() {
    this.a = 1;
}

function Gfg2() {
    this.c = 3;
}

console.log(_.assignIn({ a: 4 },
    new Gfg1, new Gfg2));

Output:

{ a: 1, c: 3 }